Machine for patching lumber.



T. ROBINSON. MACHINE FOR PATGHING LUMBER. APPLIOATION FILED AUG.10,1911.

1,048,886, 7 Patented Dec. 31, 1912.

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5W 7%; I V '7! [0% 62 zo/vreg/ T. ROBINSON. MACHINE FOR PATGHING LUMBER.APPLIOATION FILED AUG. 10, 1911.

Patented Dec. 31, 1912.

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T. ROBINSON. MACHINE FOR PATOHING LUMBER. APPLICATION mum we. 10, 1011.

1,048,886. Patented Dec.31,1912.

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COLUMBIA PLANOGRAPII (20.,WA5NINUION, D- C.

Y T. ROBINSON.

MACHINE FOR PATOHING LUMBER.

APPLICATION FILED AUG.10,1911.

1,048,886. Patentd De0.31,1912.

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COLUMBIA PLANOORAPII CO-.WA5II|NDTON. D. c.

TATES PATENT oumon.

THOMAS ROBINSON, 0F EVERETT, WASHINGTON.

MACHINE FOR PATCHING LUMBER.

To all whom it may concern:

Be it known that I, THOMAS ROBINSON, a citizen of the United States,residing at Everett, in the county of Snohomish, State of Washington,have invented a new and useful Improvement in Machines for PatchingLumber, of which the following is a specification.

My invention relates to machines for patching'lumber and comprises thenovel parts and combinations of parts which will be hereinafterdescribed and particularly pointed out in the claims.

The object of my invention is to provide a machine or apparatus whichmay be used to remove defects in lumber, such particularly as pitchseams or pockets, and also to make filling blocks or wedges which may beinserted in the holes formed in the lumber by the removal of thesedefects, whereby the face of the lumber may present a solid and smoothsurface. By treating the lumher in this manner much of it which wouldotherwise have to be discarded because of the defects mentioned, is putin condition for general use thereby effecting a very great saving ofmaterial. And when treated by my method the lumber may be used whereperfectly sound lumber is often required, for when placed in a buildingand the surface finished, the patches are scarcely discernible for thegrain thereof parallels, and usually coincides with, the grain in thelumber repaired.

In the accompanying drawings I have shown .my invention in the formwhich is now preferred by me.

Figure 1 is a side elevation of my machine. Fig. 2 is a front elevationof the same. Fig. 3 is a top plan view with parts of the cover plates orshields removed. Figs. 1 and 5 are, respectively, face and edge views ofa cutter and end of the cutter head used for removing the defect in thelumber preparatory to receiving the patch. Figs. 6 and 7 are,respectively, top and side views of the cutter used in making the patchpieces. Fig. 8 shows in perspective a piece of board from which a patchpiece has just been out, said patch piece being shown as removed towardone side. Fig. 9 shows the face appearance of the board where a patch isto be inserted.

It is quite common in all kinds of lumber, and particularly in resinouslumber, to find small imperfections which disqualify boardsSpecification of Letters Patent.

Application filed. August 10, 1911.

Patented Dec. 31,1912.

Serial No. 643,370.

for anything except the cheapest uses, when these boards are otherwiseof good quality. The most common defect of this kind in resinous lumberconsists of pitch scams or pockets, which are often of small extent butof frequent occurrence' My machine has been especially designed toremove this type of defect and to prepare the lumber for the insertionof a patch, and also for the preparation of the patch which is to beinsorted.

My machine includes a cutter head adapted to remove from the face of theboard a small section which shall include the pitch seam or pocket,forming a groove in the lumber having a regular geometrical form andadapted to receive a filling wedge of like form; a second cutter headadapted to shape the face of a board so as to form therefrom a sectionadapted, when severed along one side, to form a wedge of shape and sizeto fill the groove formed by the other cutter head; and a saw which maybe used to separate said section from the board. Such wedge piece orfiller is then glued in the groove and the surplus projection thereofremoved and the surface of the board properly dressed, whereupon itpresents a smooth, continuous surface of sound wood.

In the drawings, 1 represents a frame upon which the apparatus ismounted. This has an upper part 10 forming the base for the operatingparts. In this base is journaled a shaft 2 upon which is secured the twocutter heads and the saw referred to. The cutter head 4 is preferablysecured to one end of the shaft. This head has thereon cutters 40 whichconsist of flat cones having a notch 41 removed therefrom to form acutting edge or surface. These cutters 40 are mounted so as to projectradially beyond the head, whereby they may be sunk into the face of aboard, thereby forming a groove having surfaces of revolution true inoutline and geometrical form. To do this there must be relative.movement between the board and cutter head transversely of the axis ofthe shaft. I have mounted a bracket 15 to slide vertically in guides 14.on the frame, securing to this a board 16 to form the table or supportfor the board being operated upon. This table is moved by a rod 17actuated by a treadle 18. Brackets 12 secured to the base 10 have guideholes therein receiving the stems of presser feet 6 which are held downby springs and engage the surface of the board to assist in keeping itin proper place while being operated upon. One of these presser feet hasa pointer or indicator 61 secured thereto, whereby the point which willbe cut by the cutter may be indicated before the board is raised intocontact with the cutter. I have also provided a shield 9 covering thiscutter head. Upon the opposite end of the shaft is mounted the cutterhead 5 which is used to shape the filler wedges or patches. The cuttersused on this head are shown in Figs. 6 and 7 secured to the head. Thesecutters 5O consist of frustums of cones having their sides forming an'angle which is complemental to that of the cutters 40; that is the sumof the angles of the two cutters is 90. These cutters have a notch 51,the edge of which forms the cutting surface. They are secured on theouter ends of the heads 5 with their sides projecting laterally from thehead. A slide 53 is mounted on the base to slide in guides parallel withthe axis of the shaft, and has a supporting bracket 52 adapted to locateand, support the board from which the filler wedges are being made. Thismay be any convenient small piece of board which would be of no valuefor anything else.

The slide 53 may be moved toward the cutter head 5 in any suitable way.I have shown a bell-crank lever 55 engaging the slide by a slot 54 andactuated from the treadle 57 by rod 56. I have also shown two presserfeet 6, similar in construction and purpose as those used in connectionwith the cutter head 4, adapted to engage and support in position theboard 7.

In a central position upon the shaft 2 is a small saw 3, a table 31therefor, and a guide bar 30. The board 7 after being operated on by thecutter head 5 has a grooveor recess formed in its side extending fromits edge inward, the outline of this recess, when viewed in sideelevation, being a segment of a circle, the side face within this recessbeing a segment of the surface of a cone of low angle. When the board isoperated upon by the saw 3 this conical-segment wedge is severed fromthe board and may be removed, as is shown at the side in Fig. 8. Theangles and radial positions of the out ters 40 and 50 should be chosento correspond, so that this wedge or filler will exactly fit the recessformed by the cutter I. This filler wedge may then be placed in thegroove 80 and secured therein by glue so as to make a neat fit. It isnot necessary that the grooves '80 be of uniform size, as the fillerwedge will fit the groove accurately whatever its size so long as thegroove is not larger than the filler. The shaft 2 may be turned by abelt placed upon a pulley 20 and, preferably extended downward withinthe standard of the frame 1.

What I claim as my invention is:

1. In a machine for patching lumber, in combination, a shaft havingthereon a cutter head and cutters thereon having opposite side cuttingor forming surfaces, one radial to the shaft and the other convergingthereto with the apex outwardly, a work holding table movabletransversely of the axis of rotation of said shaft, a second cutter headon said shaft with cutters thereon having side cutting surfaces of thesame inclination to a radial plane as the inclined surfaces of thecutters on the first head, the path of said cutting surfaces forming acone with its base toward the work holder, and a work holder mounted tomove parallel to the axis of the shaft to present its work to the secondcutter head.

2. In a machine for use in patching lumher, in combination, a frame, arotative horizontal shaft, a cutter head with cutters thereon having twoedges, one radial and one inclined, meeting circumferentially andprojecting beyond the outer radius of the head, a work holder movableupward toward said head, a second cutter head on the shaft with cuttersthereon having side forming surfaces inclined at an angle complement-a1to that of the inclined edges of the other cutters, a work holdermovable toward said second head parallel with the axis of the shaft, asaw mounted on said shaft and a work guide for presenting the materialto said saw.

3. In a machine for patching lumber, in combination, a shaft havingthereon a cutter adapted to cut a conoidal groove, a work holding tableand means for moving it to present the piece to be patched to saidcutter head by movement transversely of and toward the shaft, a secondcutter head on said shaft having cutters thereon which form conoidalsurfaces agreeing with those of the first cutter head and having thebase of the cone toward the end of the shaft, a work holder adapted tohold and present the patch making stock from a pointbeyond the end ofthe shaft to said cutter head by movement parallel with the axis of theshaft.

4:. In a machine for patching lumber, in combination, a shaft havingthereon a cutter adapted to cut a conoidal groove, a work holding tableand means for moving it to present the piece to be patched to saidoutter head by movement transversely of and toward the shaft, a secondcutter head on said shaft having cutters thereon which form conoidalsurfaces agreeing with those of the first cutter head and having thebase ter heads, and a carriage for the patch mak' ing stock adapted topresent said stock endwise to the saw.

5. In a machine for patching lumber, in combination, a shaft having, onone end, a head having cutters adapted to cut a groove in stockpresented thereto by a movement radial of the cutter, which has one sidea plane and the other a section of the surface of a cone of which theother side is the base, and having on the other end a cutter headprovided with cutters adapted to form a conoidal surface agreeing withthat formed by the other cutter head, said cutters of the second headlying entirely without said cone, and a saw mounted upon the shaftbetween said cutter heads.

6. In a machine for patching lumber, in combination, a rotative shafthaving thereon two separated cutter heads, each having thereon cutters,the cutting edges of which describe like surfaces of identical cones,the said cutters on one head lying within said conical surface and uponthe other lying without said conicalsurface, means for presenting theface of the piece to be patched to the former cutter head by a movementradial of the shaft, means for presenting a patch forming stock to theother cutter head by movement in a direction parallel with the shaft andfrom the direction of the base of the cone formed by said cutters, a ripsaw upon said shaft and a carriage for present-.

ing the patch forming stock to said rip saw to sever a section of theconoidal surface formed by said second cutter head.

7. The method of patching lumber which consists in cutting from thelumber a section whose outer face formation is practicallysemi-elliptical, the straight side paralleling the grain of the wood,said section having side walls which converge and meet at the bottom,and securing in said cavity a block of like conformation.

8. The method of patching lumber which consists in cutting in the facethereof a groove having converging side walls which are surfaces ofrevolution and straight in radial section and securing in said grooveswedges having side surfaces which are like surfaces of revolution.

9. The method of patching lumber which consists in cutting a groove inthe face of the lumber having one side wall a plane and the other aconverging section of the surface of a cone, and inserting and securingtherein a wedge block having plane and conoidal side surfacescorresponding in shape and relation to those of the groove.

THOMAS ROBINSON.

Witnesses:

FRANK D. LEWIS, SOHUYLER DURYEA.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

